Smithsonian National Museum of Natural History  
Lewis and Clark as Naturalists
Ruffed grouse feet showing comb-like bristles known as pectinations, which are an adaptation for walking on snow. - Ruffed grouse feet showing comb-like bristles known as pectinations, which are an adaptation for walking on snow.

Ruffed grouse feet showing comb-like bristles known as pectinations, which are an adaptation for walking on snow.
(Smithsonian Institution)
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